/* 重置和基础样式 */
/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #333;
}

.container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

.login-box {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 40px 30px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    text-align: center;
    position: relative;
}

/* 语言切换按钮 */
/* Language switch button */
.language-switch {
    position: absolute;
    top: 15px;
    right: 15px;
    z-index: 10;
}

.language-switch a {
    color: #667eea;
    text-decoration: none;
    font-size: 12px;
    font-weight: 500;
    padding: 5px 10px;
    border: 1px solid #667eea;
    border-radius: 15px;
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.8);
}

.language-switch a:hover {
    background: #667eea;
    color: white;
    transform: translateY(-1px);
}

h1 {
    color: #2c3e50;
    margin-bottom: 10px;
    font-size: 28px;
    font-weight: 600;
}

.subtitle {
    color: #7f8c8d;
    margin-bottom: 30px;
    font-size: 14px;
}

.error-message {
    background: #ff6b6b;
    color: white;
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
}

.login-form {
    margin-bottom: 30px;
}

.form-group {
    margin-bottom: 20px;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: #2c3e50;
    font-weight: 500;
    font-size: 14px;
}

.form-group input {
    width: 100%;
    padding: 15px;
    border: 2px solid #e1e8ed;
    border-radius: 10px;
    font-size: 16px;
    transition: all 0.3s ease;
    outline: none;
}

.form-group input:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.btn-submit {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
}

.btn-submit:active {
    transform: translateY(0);
}

.footer {
    color: #95a5a6;
    font-size: 12px;
    margin-top: 20px;
}

/* 响应式设计 */
/* Responsive design */
@media (max-width: 480px) {
    .container {
        padding: 10px;
    }
    
    .login-box {
        padding: 30px 20px;
    }
    
    h1 {
        font-size: 24px;
    }
}

/* 动画效果 */
/* Animation effects */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-box {
    animation: fadeIn 0.6s ease-out;
}